A ballast is required to operate HID lamps. Historically, magnetic ballasts have ruled the roost, but their reign has gradually been eroded by digital ballasts. Digital ballasts run cooler and quieter than traditional magnetic ballasts. Other benefits include quicker start-up, greater lumen output per watt of electricity consumed, the ability to operate both MH and HPS lamps, the ability to operate a range of wattages, and the ability to dim lights. If you have any questions regarding digital ballast set up, power consumption/requirements, or any other questions; please stop by one of our locations, or give us a call and our expert staff will be happy to assist you.